CN115198044A - Method for rapidly processing blast furnace hearth freezing - Google Patents
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- C21—METALLURGY OF IRON
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- C21B7/12—Opening or sealing the tap holes
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Abstract
The invention discloses a method for rapidly treating blast furnace hearth freezing, which relates to the technical field of steel production, and comprises the steps of firstly, stopping blowing, combining downward oxygen burning in a tuyere by an artificial oxygen pipe and oxygen burning by an oxygen lance inserted into an iron notch, supplying heat to the furnace hearth to melt slag iron and discharging the slag iron from the iron notch, stopping observing the artificial oxygen burning in the tuyere when coke flame at the tuyere is increased or coke is overturned upwards, and keeping the coke flame in the tuyere to be enlarged and powerful, thereby showing that the oxygen conveyed into the furnace from the oxygen lance at the iron notch is burnt to the tuyere coke from the iron notch and the tuyere and the iron notch are burnt to be communicated. And immediately performing secondary air production, before the coke is intensively added at the upper part and is delivered to the hearth, the heat of the hearth is rapidly increased by oxygen enrichment and coal injection at low air quantity, and the aim of shortening the freezing treatment time of the hearth is fulfilled.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for rapidly treating blast furnace hearth freezing.
Background
The freezing of the furnace hearth of the blast furnace is one of the most serious accidents in the production of the blast furnace. In recent years, accidents frequently occur because a blast furnace cooler leaks a large amount of water, and the water is not timely found and treated, and the furnace is closed and the planned long-term damping-down treatment is not proper. The quality of the original fuel is deteriorated, the blast furnace is cold, the iron slag can not flow out from the iron notch smoothly, the slag is filled into the air port automatically, the air quantity is greatly shrunk and gradually reduced to zero when the blast furnace is serious, the air pressure is 200-300kPa, and even more, the iron slag is burnt through from the air port sleeve, so that more accidents are caused.
CN107254560 discloses a method for treating blast furnace hearth freezing and an oxygen lance used by the method, comprising the following steps: (1) Blowing down the blast furnace, dredging a slag iron runner in front of the blast furnace, and preparing for discharging slag iron; (2) Installing a drill rod on the taphole tapping machine, and pre-drilling the taphole to a red point by using a drill bit; (3) The iron notch tapping machine is changed with an oxygen lance, and the oxygen lance is jacked into a red point in an iron notch channel; (4) introducing oxygen and compressed air into the oxygen lance; (5) The oxygen lance is withdrawn from an iron notch at regular intervals, and a fused slag-iron mixture is discharged; (6) When the volume of the discharged slag iron mixture reaches 20-40% of the volume of the hearth, the blast furnace is re-ventilated; (7) And (5) repeating the operation of the step (5), and gradually adding wind until the working state of the hearth is completely recovered. The method emphasizes that the iron-mouth oxygen lance is used for treating furnace hearth freezing, but the degree of oxygen lance burning is not accurate enough, and two situations do not occur easily: (1) the blast furnace is early in air recovery time, the tuyere is not communicated with the taphole after air supply, slag iron generated after air supply cannot be smoothly discharged from the taphole, and the slag iron liquid level rises to cause slag filling of the tuyere and even damage of a small sleeve in the tuyere, so that the tuyere is easy to repeat and more serious loss is caused; (2) the re-air time of the blast furnace is late, and the rapid processing of the freezing process of the hearth is influenced.
CN108977601B discloses a method for penetrating through a blast furnace tuyere and an iron notch, which mainly solves the technical problems of low efficiency and high cost of the method for penetrating through the blast furnace tuyere and the iron notch in the prior art, and comprises the following steps: 1) Drilling through a mud bag at the iron notch of the blast furnace to ensure that the iron notch pore passage of the iron notch of the blast furnace is smooth; 2) Removing the middle sleeve and the small sleeve of the blast furnace tuyere, and opening coke at the front end of the blast furnace tuyere to form a spittoon; 3) Sequentially charging aluminum ingots and coke into a spittoon at the front end of an air port of the blast furnace; 4) Oxygen burning operation is carried out on the spittoon at the front end of the blast furnace tuyere; 5) When aluminum liquid seeps out from the taphole hole channel of the blast furnace taphole, the oxygen burning operation is stopped. The oxygen burning operation is emphasized to be carried out on the spittoon at the front end of the blast furnace tuyere, whether the tuyere is communicated with the iron notch or not is visually judged through the outflow of molten aluminum at the iron notch, but an oxygen lance is not arranged on the iron notch, and the communication effect between the tuyere and the iron notch needs to be reduced.
In the metallurgical industry publishers, 2013 and P16 of blast furnace disorder and accident treatment, once the tap hole can normally tap iron, the working tuyere accounts for more than 90 percent of the total number, and the furnace hearth freezing treatment is fully completed. And then, the operation is shifted to the operations of adjusting load, recovering coal injection, adjusting furnace temperature and the like so as to gradually recover the smooth operation of the furnace condition. If the process of freezing the hearth is not repeated, it generally takes about one week from the start of the process to the time when it is substantially normal. The treatment of the freezing accident of the furnace hearth is sometimes quite difficult, particularly when the coke is waited to be discharged, the slag is gushed from the tuyere, and the iron notch is not opened. Practice proves that only when the clean coke is discharged into the hearth, the furnace can be really heated up to gradually melt the condensate in the hearth. And (4) completing the freezing treatment of the furnace hearth, and then switching to the operations of adjusting the load, recovering coal injection, adjusting the furnace temperature and the like.
Because the hearth is frozen only when the blast furnace is seriously lack of heat, the working air inlet has small air quantity when the hearth is frozen and is treated in the early stage, the coke is intensively added from the upper part of the blast furnace for 1 to 2 days, and the coke can be added into the hearth for even longer time, so that how to quickly improve the heat of the hearth before the coke is intensively added and the hearth is released is realized, and the freezing time of the treatment hearth is shortened.
Disclosure of Invention
The invention aims at the technical problems, overcomes the defects of the prior art, and provides a method for quickly treating the freezing of a blast furnace hearth, which comprises the following steps:
1) Judging whether the furnace hearth is frozen or not, and if so, stopping blowing down;
2) And (3) finishing the work after damping down:
(1) the method comprises the following steps of (1) dismounting 2 tuyere small sleeves above an iron notch, manually burning an oxygen pipe from the tuyere to the iron notch, simultaneously installing an oxygen gun on the iron notch, introducing oxygen to burn slag iron and coke in a hearth, heating the slag iron in the hearth to melt the slag iron, and not discharging the slag iron by a gun periodically, so that the iron notch is communicated with the tuyere;
(2) for the rest slag iron filling air ports, manually using an oxygen pipe to burn oxygen to heat slag iron and discharge the slag iron from the air ports until all the slag iron in the air ports is coked;
(3) replacing or cleaning the air supply device filled with the slag;
(4) 2-4 air ports above the iron opening are opened, and the rest air ports are tightly blocked by mud;
3) After the damping down work is finished, air is again blown, the upper part is intensively coked, and the coke load is subsequently adjusted until the coke enters a normal production state;
4) After the blast furnace is re-aired, restoring the air quantity, and enriching oxygen when the air quantity is restored to be more than 15% of the normal air quantity;
5) Coal injection is carried out after the blast furnace is rich in oxygen, and if the upper part of the blast furnace is intensively coked and reaches below the furnace waist of the blast furnace, coal injection is not carried out;
6) Before the freezing of the hearth is not eliminated, the air temperature of the supplied air is the highest air temperature provided by the hot-blast stove;
7) 2 air ports beside the opened air port can be poked continuously in sequence to improve the air quantity each time the slag iron is discharged and the opened air port works normally; the freezing of the furnace hearth is eliminated, and then the furnace condition is comprehensively recovered; and continuously poking the air quantity on the air opening to accelerate the air opening speed until the air opening is fully opened, and enabling the blast furnace to enter a normal adjustment smelting state.
The technical scheme of the invention is further defined as follows:
the method for rapidly processing the freezing of the blast furnace hearth meets the following conditions, and can definitely judge that the blast furnace hearth is frozen: because the temperature of the iron slag is low, when the iron slag can not flow out from the iron notch smoothly and automatically; the normal working tuyere is reduced to be below 20 percent, and other tuyeres are basically solidified by cold slag iron; the air quantity is sharply reduced even to 0m 3 And/min, the wind pressure is still more than 100kPa, and the blast furnace is in a wind holding state.
In the method for rapidly processing the blast furnace hearth freezing, the burn-on judgment standard is as follows: when the coke flame at the tuyere is increased or coke is turned upwards, the observation of manual oxygen burning at the tuyere is stopped, the coke flame in the tuyere can be clearly seen to be enlarged and powerful, which indicates that oxygen conveyed into the furnace from the iron notch oxygen lance is burnt to the coke at the tuyere from the iron notch, and indicates that the oxygen burning areas are communicated through the tuyere and the iron notch in opposite directions.
The method for quickly treating blast furnace hearth freezing is characterized in that the upper part is intensively coked, the ratio of the coke volume to the hearth volume is 1:1, the coke load is adjusted to be 1.8-2.2 after the coke is completely coked, the coke load is adjusted to be 2.3-2.7 after one smelting period, the coke load is adjusted to be 2.8-3.2 after two smelting periods, and the normal production state is subsequently entered.
In the method for rapidly processing the blast furnace hearth freezing, the oxygen enrichment satisfies the following conditions: the oxygen enrichment rate is more than or equal to 10 percent, and the theoretical combustion temperature of the tuyere is more than or equal to 2350 ℃.
The method for rapidly processing the freezing of the blast furnace hearth has the advantages that the coal injection quantity meets the following requirements: the coal injection ratio is not less than that in normal production, and the theoretical combustion temperature of the tuyere is not more than 2000 ℃.
The method for rapidly processing the blast furnace hearth freezing indicates that the hearth freezing is eliminated when the proportion of the air supply tuyere to all the tuyeres is more than or equal to 50 percent, the molten iron [ Si ] is more than or equal to 0.5 percent, and the molten iron [ S ] is less than or equal to 0.05 percent or approaches the normal desulfurization capacity of the hearth.
The invention has the beneficial effects that: the method combines manual work of burning oxygen at a tuyere and inserting an oxygen lance into an iron notch to burn oxygen to treat the furnace cylinder for freezing, the iron notch and the tuyere above are burnt through, the iron notch in the furnace cylinder is communicated with the tuyere above, and then the production is carried out by repeating wind, so that the situation that oxygen enrichment and coal injection are carried out until the furnace cylinder freezing treatment is finished in the past is changed, the heat of the furnace cylinder is rapidly improved by oxygen enrichment and coal injection through the tuyere in advance when the air quantity is very small, the speed of recovering the working state of the furnace cylinder is accelerated, the furnace cylinder freezing treatment time is shortened by 7-14 days compared with the conventional method, and a large amount of labor and material cost is saved.
Detailed Description
Example 1
And (4) starting up a second-generation furnace for ignition and air supply in 12 and 28 months in 2018 of a certain blast furnace. The air volume is 3300m after 30 days 3 Min (return to normal air quantity 3800m 3 87% of/min), 955 ℃ of wind temperature, 140kg/t of coal ratio and 11000m of rich oxygen 3 H is used as the reference value. Because the cross temperature measurement at the top of the blast furnace Liang Loushui cannot be judged in time, a large amount of cooling water leaks into the blast furnace from the upper part of the blast furnace, the blast furnace is cooled when the leaked water enters the lower part of the blast furnace, the air permeability of a charge column in the blast furnace is gradually poor in 12-month 31-day night shift, the blanking is not smooth, and the suspension and material setting treatment is carried out in a way of (3). 4, the temperature of the tuyere is slightly low and cool by visual observation at about 00 ℃, 15 tuyeres can be bright, and the rest 11 tuyeres are black. And when the air inlet reaches 8. And 9, automatically burning out the slag from the tuyere peepholes of No. 14 and No. 19, and completely filling the slag into the emergent damping tuyere until the blast furnace hearth is frozen.
31/12/2018/1/20/50 damping-down for 35.32 hours, and the main treatment items are as follows: (1) 2 tuyere small sleeves above the No. 1 and No. 3 iron openings are detached, an oxygen pipe is used for manual burning from the tuyere to the iron opening, 3 iron openings are embedded into the oxygen gun to burn the condensed slag iron and coke in the hearth by introducing oxygen, the heat of the hearth is improved, the condensed slag iron in the hearth is discharged, the hearth is heated from bottom to top, and the slag iron can be rapidly melted until the iron opening in the hearth is communicated with the tuyere above. (2) And (4) manually burning the rest of the tuyere filled with the slag downwards by using an oxygen pipe, and discharging the tuyere filled with the slag until all the tuyere is filled with coke. (3) And replacing all tuyere devices (a blowing pipe, an oblique head and a straight section) for filling slag.
1 month, 1 day 20: and 8 tuyere re-airing openings (25 #, 26#, 1#, 2# tuyeres above the 1# iron notch, and 14#, 15#, 16# and 17# tuyeres above the 3# iron notch) are arranged at 50, and mud is blocked at the rest tuyere. The outlet air quantity of the fan is 168m 3 Min, air quantity in furnace shows 0m 3 Min, wind pressure 70kPa, wind temperature 628 ℃.
2 day 3 3 Min, air quantity in furnace shows 0m 3 Min, air pressure 73kPa, air temperature 700 ℃.4: and (30) preparing tuyere oxygen enrichment. 5, after air is added to the air inlet of the air blower, the air quantity at the outlet of the air blower is 415m 3 Min, air quantity in furnace display 410m 3 Min, wind pressure 88kPa, wind temperature 728 ℃.7:05 oxygen-enriched 1500m 3 The heat of a furnace hearth (the oxygen enrichment rate is 3.3 percent, the theoretical combustion of a tuyere is 2259 ℃) is improved by per hour, and the air quantity entering the furnace is 589m 3 The air pressure is 101kPa and the air temperature is 859 ℃ per min (which is 15.7 percent of the normal air quantity). 9:00 oxygen-enriched 2100m 3 Per hour (oxygen enrichment ratio of 4.5%, theoretical combustion at tuyere 2303 ℃), and furnace inlet air quantity of 613m 3 Min, wind pressure 102kPa, wind temperature 856 ℃. The volume of 200t of upper concentrated coking is 370m 3 The volume ratio of the intensively added Jiao Tiji to the hearth is 1.0, the load of the coke is 2.08 after the material is lightly loaded. 16, and after the automatic slag pouring and blowing down for 4.03 hours by using a blowing pipe above a No. 161 iron notch, 20: and (5) after air supply, continuing to enrich oxygen. 23:00 oxygen-enriched 2200m 3 Per hour (oxygen enrichment ratio is 4.1%, theoretical combustion of tuyere is 2307 ℃), and the air quantity entering the furnace is 706m 3 Min, 99kPa wind pressure and 883 ℃ wind temperature. 23:5526 the large set turns red.
Day 3, 0: slag runs between the large sleeves in the 031# -25 # tuyeres. 2, 38 to 10, 7.45 hours of damping down for welding and repairing gaps of 25#, 26#, 1# middle sleeves and large sleeves, and cleaning 14# and 15# blowpipes and slag pouring. 10, 05 air supply, 12 3 H,13 3 Perh (oxygen enrichment rate of 4.7 percent and tuyere theoretical combustion of 2310 ℃), and the air quantity entering the furnace is 670m 3 Min, wind pressure 91kPa, wind temperature 854 ℃.13 (32) tapping (3 # taphole), the temperature of molten iron is 1351 ℃, the slag FeO is tested to be 8.08 percent, and the R2 is tested to be 0.94. 14, tapping (No. 1 taphole) at 45, measuring the temperature of molten iron at 1250 ℃, and mixing the components of the molten iron: [ Si ]]0.27%、[S]0.185%, assay slag FeO 8.86%, R2 0.86%. 15:28 start coal injection 6t/h,16 3 /h（Oxygen enrichment rate of 5.1 percent and theoretical combustion of a tuyere of 2049 ℃ and air quantity entering the furnace of 700m 3 The temperature is 930 ℃ under the conditions of/min, wind pressure of 85kPa and wind temperature of 930 ℃.22 3 Perh (oxygen enrichment ratio is 5.1%, theoretical combustion of a tuyere is 2112 ℃), and the air quantity entering the furnace is 800m 3 Min, wind pressure 118kPa, wind temperature 1013 ℃.
The temperature of the slag iron is improved after 4 days, the FeO of the slag is reduced to 1.56-3.25% and fluctuates, and R2 is 0.94-1.01. According to the slag iron discharge outside the furnace and the temperature condition of the slag iron, the tuyere needs to be opened, but 13# and 18# tuyeres above the 3# iron notch are poked for multiple times without poking.
And 4 tuyeres (25 #, 26#, 1#, 2 #) above the 1# taphole are automatically filled with slag gradually and automatically after 5 days because the molten slag on the upper part is discharged out of the hearth, and 2.9, 47 air supply and blocking 25#, 26#, 1# and 2# air ports above the 1# iron notch, adjusting to 8 air ports including 12# -19 # air ports above the 3# iron notch, and recovering oxygen enrichment of 2000m after air supply 3 And h, 6t/h of coal injection. And (3) blowing out the tuyere of No. 11. 13, reducing the FeO content of the slag to 0.43-0.9%, wherein R2 is 0.97-1.09, and the temperature of molten iron is 1304-1320 ℃.14]、[S]Respectively as follows: 0.73%, 0.190%,18]、[S]Respectively as follows: 0.83%, 0.076%,17 to 22, and 11#, 20#, 21# tuyeres are opened in sequence, wherein the ratio of [ Si ] in molten iron of 50]、[S]Respectively as follows: 1.2%, 0.069%, and no poking of No. 23 3010 tuyere, and until this time, 11 tuyeres are blown.
0 day 6 3 H (oxygen enrichment rate of 2.4 percent, theoretical combustion at a tuyere of 2023 ℃), and the air inlet quantity of 1270m 3 Min, 223kPa air pressure, 1087 ℃ air temperature and 8t/h coal injection. 0:4522# tuyere disclosed an eye, 1: and (3) poking the 2610# air ports, so far, 13 opened air ports account for 50% of all air ports. 10 3 Min, oxygen enrichment 3800m 3 The air pressure is 278kPa, the air temperature is 1080 ℃, and the coal injection is 14t/h. The remaining 9 air ports are not opened, and the treatment is carried out for 16. 21, 16 re-plugging 6#, 7#, 8# tuyeres and opening 23 tuyeresAnd (5) recovering wind.
6, 7 days]Comprises the following steps: 0.84% of molten iron [ S ]]Reducing the temperature to 0.042 percent, and refining qualified molten iron; the slag FeO had dropped to 0.26% and the slag basicity R2 was 1.15.8]0.63%, [ S ]]When the temperature of the furnace hearth is reduced to 0.023 percent, the heat of the furnace hearth continuously rises, and the slag molten iron component is recovered to the normal furnace condition level, so that the freezing treatment of the furnace hearth is finished. The subsequent process is transferred to the stage of enlarging battle fruit and strengthening blast furnace production. 20: and 5, poking an 8# air opening 56, poking 7# and 6# air openings 8 days 0 3 The full wind state of/min.
As the cross temperature measurement Liang Loushui leaks into the blast furnace from the upper part of the blast furnace, more than 2000 tons of materials in the furnace are wetted, and the iron-making range of the freezing degree of the hearth is rare. The freezing process of the treatment hearth adopts the heating hearth technologies of low air quantity oxygen enrichment, quick coal injection, discharging condensed slag iron by inserting an oxygen lance into an iron notch and the like to improve the temperature of the hearth, so that an external ironmaking specialist can recover normal production of the blast furnace which is only treated by furnace raking in a short period of time, and precious and extremely difficult accident treatment experience is accumulated for ironmaking.
Example 2
10 months a certain blast furnace (450 m) in 2021 3 ) Because the furnace sealing time is long and the coke quality is reduced, the temperature of the blast furnace is cooled shortly after air supply, the slag is difficult to discharge from an iron notch, the blast furnace is stopped after the slag is automatically poured at the 8-day air notch, the traditional manual oxygen pipe is adopted to burn oxygen from the iron notch to the air port and burn oxygen from the air port to the iron notch, the air port is communicated with the iron notch to prepare air restoration, 4 air ports above the iron notch are opened to supply air, and the other 11 air ports are tightly blocked by mud. When the production is carried out by repeating the wind in the day, jiao Diwen is added in the upper part after the wind is repeated, molten iron is discharged from the iron notch at the lower part normally in 9 days, but the slag is difficult to discharge, 60 to 100 tons of slag are not discharged, slag is gradually gushed and poured into the air ports, 14. 21 3 And/min, the blast furnace with the wind pressure of 271KPa hardly enters air, the furnace hearth is frozen and is forced to stop blowing 30 days after being frozen, and the blowing time is 10 days and 0 days.
After damping down, the hearth is treated according to the method of the invention to freeze:
completing the work during the damping down:
(1) unloading the tuyere small sleeves 2 above the taphole, and manually burning the tuyere small sleeves by using an oxygen pipe in the direction of the taphole; the iron notch is provided with an oxygen lance, oxygen is introduced to burn cold slag iron and coke in the hearth, the slag iron in the hearth is heated to be molten, and the slag iron is not discharged by periodically raking the lance. The purpose of this work is that the iron notch and wind gap burn through, and the burn-through judgement standard is: the coke burning flame in the tuyere can be clearly seen to be enlarged and powerful, which indicates that oxygen is burnt simultaneously through the tuyere and the iron notch, and the area is locally burnt through.
(2) And for the rest slag iron filling tuyeres, manually burning oxygen by using an oxygen pipe to heat slag iron to be discharged from the tuyeres until coke is found in all the tuyeres.
(3) And replacing or cleaning the air supply device filled with the slag.
(4) 2 air ports above the iron opening, and the rest air ports are tightly blocked by mud.
And (3) after the 13-day 4.
And 7, opening an iron hole to discharge secondary air, and discharging normal iron. 7, the furnace inlet air volume is 372m 3 Min, 108kPa.7, 52, enriching oxygen by 4m 3 Min,7:55 to 10m 3 Nini, considering that the amount of coke concentrated in the furnace is sufficient and has fallen below the waist of the blast furnace, no coal injection is required, and the 14# and 2# tuyeres are disclosed.
11 3 Nin, oxygen enrichment of 15m 3 Nin, wind pressure 135kPa.
13, 7 air ports are opened in the air inlet of the air inlet, and the air volume is 730m 3 Nin, oxygen enrichment of 15m 3 /nin。
19, 8 air ports are opened in the air inlet 25, 2 air ports are poked, and the air quantity is 970m 3 Nin, oxygen enrichment of 15m 3 And/nin. 22, 10 air ports are opened in 11, so that the freezing of the furnace hearth is eliminated, and the stage of enlarging the battle fruit and comprehensively recovering the furnace condition is carried out.
14 days 9 3 Nin, wind pressure 207kPa, wind temperature 1026 ℃. In the afternoonAfter damping down treatment of 4 air ports, the air quantity is increased.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A method for rapidly processing blast furnace hearth freezing is characterized by comprising the following steps: the method comprises the following steps:
1) Judging whether the furnace hearth is frozen or not, and if so, stopping blowing;
2) And (3) finishing the work after damping down:
(1) 2 tuyere small sleeves above the iron notch are disassembled, an oxygen pipe is used for manual burning from the tuyere to the iron notch direction, meanwhile, an oxygen lance is arranged on the iron notch for introducing oxygen to burn slag iron and coke in a hearth, the slag iron in the hearth is heated to be melted and is not discharged by regularly raking the lance, and the purpose is that the iron notch is communicated with the tuyere;
(2) for the rest slag iron filling tuyeres, manually burning oxygen by using an oxygen pipe to heat slag iron to be discharged from the tuyeres until coke is found in all the tuyeres;
(3) replacing or cleaning the air supply device filled with the slag;
(4) 2-4 air ports above the iron opening, and the rest air ports are tightly blocked by mud;
3) After the damping down work is finished, the air is re-blown, the coke is intensively added at the upper part, and the coke load is subsequently adjusted until the coke enters a normal production state;
4) After the blast furnace is re-aired, restoring the air quantity, and enriching oxygen when the air quantity is restored to be more than 15% of the normal air quantity;
5) Coal injection is carried out after the blast furnace is rich in oxygen, and if the upper part of the blast furnace is intensively coked and reaches below the furnace waist of the blast furnace, coal injection is not carried out;
6) Before the hearth is frozen and not eliminated, the air temperature of the air supply is the highest air temperature provided by the hot-blast stove;
7) 2 air ports beside the opened air port can be poked continuously in sequence to improve the air quantity each time the slag iron is discharged and the opened air port works normally; the freezing of the furnace hearth is eliminated, and then the furnace condition is comprehensively recovered; and continuously poking the air quantity on the air opening to accelerate the air opening speed until the air opening is fully opened, and enabling the blast furnace to enter a normal adjustment smelting state.
2. The method for rapidly processing the freezing of the blast furnace hearth according to the claim 1, characterized in that: the following conditions are met, and the freezing of the blast furnace hearth can be definitely judged: because the temperature of the iron slag is low, when the iron slag can not flow out from the iron notch smoothly and automatically; the normal working tuyere is reduced to be below 20 percent, and other tuyeres are basically solidified by cold slag iron; the air quantity is sharply reduced even to 0m 3 And/min, the wind pressure is still more than 100kPa, and the blast furnace is in a wind holding state.
3. The method for rapidly processing the freezing of the blast furnace hearth according to the claim 1, characterized in that: the burn-on judgment standard is as follows: when the coke flame at the tuyere is increased or coke is turned upwards, the observation of manual oxygen burning at the tuyere is stopped, the coke flame in the tuyere can be clearly seen to be enlarged and powerful, which indicates that oxygen conveyed into the furnace from the iron notch oxygen lance is burnt to the coke at the tuyere from the iron notch, and indicates that the oxygen burning areas are communicated through the tuyere and the iron notch in opposite directions.
4. The method for rapidly processing the freezing of the blast furnace hearth according to the claim 1, characterized in that: the upper part is intensively coked, the ratio of the coke volume to the hearth volume is 1:1, the coke load is adjusted to be 1.8-2.2 after the coke is completely added, the coke load is adjusted to be 2.3-2.7 after one smelting period, the coke load is adjusted to be 2.8-3.2 after two smelting periods, and the process enters a normal production state subsequently.
5. The method for rapidly processing the freezing of the hearth of the blast furnace according to claim 1, wherein the method comprises the following steps: the oxygen enrichment satisfies the following conditions: the oxygen enrichment rate is more than or equal to 10 percent, and the theoretical combustion temperature of the tuyere is more than or equal to 2350 ℃.
6. The method for rapidly processing the freezing of the blast furnace hearth according to the claim 1, characterized in that: the coal injection quantity meets the following requirements: the coal injection ratio is not less than that in normal production, and the theoretical combustion temperature of the tuyere is not more than 2000 ℃.
7. The method for rapidly processing the freezing of the blast furnace hearth according to the claim 1, characterized in that: when the ratio of the air supply tuyere to all the tuyeres is more than or equal to 50 percent, the molten iron [ Si ] is more than or equal to 0.5 percent, and the molten iron [ S ] is less than or equal to 0.05 percent or approaches the normal desulfurization capacity of the furnace hearth, the freezing of the furnace hearth is eliminated.
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| CN103757167A (en) * | 2014-01-14 | 2014-04-30 | 攀钢集团成都钢钒有限公司 | Iron notch pretreatment method used during blowing in of blast furnace |
| CN107254560A (en) * | 2017-05-12 | 2017-10-17 | 江苏金基特钢有限公司 | The processing blast furnace crucibe method freezed and the iron mouthful oxygen rifle used |
| CN108977601A (en) * | 2017-06-05 | 2018-12-11 | 上海梅山钢铁股份有限公司 | A kind of method of unchoking blast furnace tuyere and iron mouth |
| CN114438268A (en) * | 2022-02-11 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Boiling device and method for processing blast furnace hearth freezing |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757167A (en) * | 2014-01-14 | 2014-04-30 | 攀钢集团成都钢钒有限公司 | Iron notch pretreatment method used during blowing in of blast furnace |
| CN107254560A (en) * | 2017-05-12 | 2017-10-17 | 江苏金基特钢有限公司 | The processing blast furnace crucibe method freezed and the iron mouthful oxygen rifle used |
| CN108977601A (en) * | 2017-06-05 | 2018-12-11 | 上海梅山钢铁股份有限公司 | A kind of method of unchoking blast furnace tuyere and iron mouth |
| CN114438268A (en) * | 2022-02-11 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Boiling device and method for processing blast furnace hearth freezing |
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